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Distal Radius Fractures: Treatment Options Melvin P Distal Radius Fractures: Treatment Options Melvin P. Rosenwasser, MD Robert E. Carroll Professor of Hand Surgery Chief, Orthopaedic Hand, Trauma Services Director, Trauma Training Center Columbia-Presbyterian Medical Center Introduction ● Goal: recovery of normal function: restore natural bow of the radius to maintain motion and grip strength normalization of length axial alignment rotational alignment ● Evaluation Neuro-vascular exam Compartment syndrome of the forearm can occur secondary to injury Tense swelling, pain with passive motion, paresthesias Forearm fasciotomy ● Radiographs AP, lateral, oblique [also include wrist, elbow, with special attention to DRUJ. ● Etiology High energy trauma: MVA, fall from height, GSW Anatomy ● Articulation of the distal radius with the scaphoid and lunate bones of the carpus The distal radioulnar joint (DRUJ) Articulation of distal ulna with the triangular fibrocartilage complex (TFC) The TFC articulates with both the lunate and the triquetrum of the carpus. The scaphoid and lunate fossa are two concave articular surfaces separated by a dorso- volar ridge. A third concave articulation, the sigmoid notch, exists for the head of the ulna. The contact area with the TFC varies with changing degrees of rotation of the wrist. The amount of force transmitted between the TFC and the radius therefore varies with changing degrees of pronation and supination. In supination, the ulnar head displaces volarly in the sigmoid notch, while in pronation it rotates dorsally. ● Normal Anatomy: Distal Radius Radial inclination angle: 23 degrees (AP x-ray) Volar tilt (palmar inclination angle): 10 degrees (Lateral x-ray) Ulnar variance (radial length): mean -0.9 mm (AP x-ray) Classification ● AO/ASIF classification of diaphyseal forearm fracture patterns Open fracture Ratio of open fractures to closed is higher for forearm than other bones except tibia Increased incidence of nerve laceration Debridement, irrigation, rigid fixation ORIF within 24 hours: external fixation, intramedullary nailing, or plating antibiotics Prevention of infection is necessary to avoid malunion, nonunion, loss of function and amputation Comminuted fracture Standard plating Lag-screw fixation of the pieces Defect can be bone grafted ● Frykman Classification System 8 categories Considers ulnar styloid Does not consider direction or amount of displacement of fracture fragments AO Classification System 27 total fracture patterns Highly detailed but unwieldy for easy use and memorization ● Melone Classification System Applicable only to intra-articular fractures Helpful in understanding the ‘die-punch’ lesion ● The Problem with Classification Systems Andersen DJ, Blair WF, Steyers CM Jr, Adams BD, el-Khouri GY, Brandser EA. Classification of distal radius fractures: an analysis of interobserver reliability and intraobserver reproducibility. J Hand Surg 1996;21A(4):574-82. Analyzed inter/intra observer agreement for Frykman, AO, Melone, and Mayo systems None of the systems showed substantial interobserver agreement Instability ● Lafontaine M, Hardy D, Delince P. Stability assessment of distal radius fractures. Injury 1989;20(4):208-10. ● La Fontaine (1989) criteria: Dorsal tilt >20 degrees Dorsal comminution Intra-articular fracture Associated ulnar fracture Age over 60 years ● 3 or more tended to collapse Treatment Options ● Tools to work with in achieving best reduction Plaster Pins External fixation Plates Screws Bone graft or filler Arthroscopy Criteria for Acceptable Reduction ● Change in volar (palmar) tilt < 10° (ie, neutral or 20 palmar slope) ● Radial shortening < 2 mm ● Change in radial angle < 5° ● When intra-articular fracture is present: Articular step-off < 1-2 mm Rationale for the Guidelines ● Intra-articular step-off Knirk JL, Jupiter JB. Intra-articular fractures of the distal end of the radius in young adults. J Bone Joint Surg 1986;68A(5):647-59. 2 mm step-off on AP x-ray greatly increased the risk of symptomatic osteoarthritis at 7 year follow-up Dorsal tilt and radial length not much affect on outcome Intra-Articular Incongruency ● Trumble TE, Schmitt SR, Vedder NB. Factors affecting functional outcome of displaced intra-articular distal radius fractures. J Hand Surg 1994;19A(2):325-40. 3 year follow-up of 52 fx’s Single most important factor that correlated with outcome was intra-articular gap between fragments Residual loss of volar or radial tilt did not correlate with outcome ● Catalano LW 3rd, Cole RJ, Gelberman RH, Evanoff BA, Gilula LA, Borrelli J Jr. Displaced intra-articular fractures of the distal aspect of the radius. Long-term results in young adults after open reduction and internal fixation. J Bone Joint Surg 1997;79A(9):1290-302. 7 year follow-up of 26 fx’s All treated with surgery Residual articular displacement (CT scan and x-ray) correlated with radiographic changes but not with functional outcome What is Important? ● Does the fracture extend to the opposite cortex of the radius? i.e., volar cortex for Colles ● Percutaneous fixation alone Extra-articular fracture Younger patient (good bone stock) Good soft tissue envelope Need adjunctive cast/brace ● ‘Kapandji’ Intrafocal Pinning A technique of K-pinning using the pin itself to buttress the fracture site; usually requires ex-fix or cast ● Pin Placement Pins are placed avoiding any contact with flexor tendons Contraindications ● Significant intra-articular displacement ● Volar cortical comminution ● Inability to obtain an anatomic reduction Clinical Results ● Greatting MD, Bishop AT. Intrafocal (Kapandji) pinning of unstable fractures of the distal radius. Orthop Clin of North America 1993;24(2):301-7. 23 patients, 24 unstable fx of distal radius 2 to 3 0.062 K-wires maintained for 4 weeks 6 weeks Short Arm Cast Results: Patients < 65 years of age 79% good or excellent radiologic results Patients > 65 years of age 60% good or excellent radiologic results UNION IN ALL PATIENTS ● Trumble TE, Wagner W, Hanel DP, Vedder NB, Gilbert M. Intrafocal (Kapandji) pinning of distal radius fractures with and without external fixation. J Hand Surg 1998;23A(3):381-94. Trumble TE, et.al. J Hand Surg 1998;23A(3):381-94 73 patients Kapandji pinning with or without ex fix All had dorsally displaced extra-articular fx Results: Older patients Range of motion, grip strength & pain relief significantly better w/ ex fix Younger patients w/ comminution of only 1 surface Good results w/ Kapandji pinning alone w/ comminution of > 2 sides Better results w/ ex fix ● Stoffelen DV, Broos PL. Closed reduction versus Kapandji-pinning for extra-articular distal radial fractures. J Hand Surg 1999;24B(1):89-91. 98 patients with extra-articular distal radius fractures Prospective randomized trial Results Closed Reduction and Plaster Cast Group 74% good, excellent Cooney score Kapandji-Pinning Group 75% good, excellent Cooney score Volar Plating with Extra-articular plates 1. Approach Make longitudinal incision slightly radial to the flexor carpi radialis tendon (FCR). Dissect between FCR and radial artery. 2. External Fixation ● ‘Ligamentotaxis’ pulls on the fracture fragments to reduce and prevent collapse ● Cannot restore normal volar tilt by pulling straight distally alone, a palmar vector is required ● External Fixation Advantages Easy to apply Access to wound/pins ‘Neutralizes’ fracture site Frees up the elbow Light ● External Fixation Disadvantages Does not necessarily reduce the fracture alone Possible pin-tract infection ? more stiffness with excessive distraction Non-Joint Spanning Ex-Fix: What’s New? ● Indications Unstable extra- or intra-articular distal radius fractures (DRF) Failed closed reduction Distal fragment size ≥ 6mm McQueen recommends ≥ 10mm Young patient Good bone stock ● Treatment Options Closed reduction - cast Percutaneous pinning - cast Pinning - ExFix ORIF Dynamic ExFix Non-joint spanning ExFix ● Patient’s Trauma 30 year old male sustained right distal radius fracture while snowboarding Injury occurred 10 days prior to operation X-ray reveals a minimally displaced right distal radius fracture with a noticeably depressed lunate fossa as well as loss of volar tilt. Benefits (Non-joint spanning ExFix) ● Rigid anatomic fixation ● Early motion ● Normal carpal load transfer / mobility ● Avoids late stiffness (no ligamentotaxis) Technical Considerations ● What I use ● Standard proximal pins placement ● Mini C-arm to place distal pins ● Transverse pin placement ● Pins as joy-sticks to control fragment ● Radio-ulnar & volar-dorsal translation ● Both pins dorsally ● Supplement with percutaneous K-wires ● No ligamentotaxis = less stiffness? Postop Care ● ROM after resolution of postop pain ● Interval splinting for 2-4 weeks (prevent pin tract infection) Fischer T, Koch P, Saager C, Kohut GN. The radio-radial external fixator in the treatment of fractures of the distal radius. J Hand Surg 1999;24B(5):604-9. Patient’s Trauma ● 46 year old male sustained injury from a fall while roller skating Sustained markedly displaced, comminuted and impacted fracture of the left distal radius metaphysis with intraarticular extension. Closed reduction failed to maintain alignment There was a radial neurapraxia of his left thumb and marked instability with displacement of his distal radius. Clinical Studies ● Melendez EM, Mehne DK, Posner MA. Treatment of unstable Colles’ fractures with a new radius mini-fixator. J Hand Surg 1989;14A(5):807-11. 13 cases All
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